While this is legal in Swagger 2.0 ``` swagger: 2.0 (...) paths: /search: get: (...) parameters: - name: term in: query description: search string required: false type: string ``` ng-swagger-gen will fail with `Error: TypeError: Cannot read property 'type' of undefined` because it expects the `items` to be defined (like so): ``` swagger: 2.0 (...) paths: /search: get: (...) parameters: - name: term in: query description: search string required: false type: string items: type: string ``` This can be fixed by defaulting type `itemType` (ln 908) to string